Her seferinde MS nin sitesinde aramaktan bıktım, buradan indirilebilir.
Microsoft® SQL Server® 2008 R2 SP2 - Express Edition (with Management Studio Express)
http://www.microsoft.com/en-us/download/details.aspx?id=30438
Microsoft SQL Server 2008 R2 RTM - Express
http://www.microsoft.com/en-us/download/details.aspx?id=3743
Microsoft SQL Server 2008 R2 RTM - Management Studio Express
http://www.microsoft.com/en-us/download/details.aspx?id=22985
RTM nedir diye sorarsanız : Released To Manufacturing. "üretim için yayımlamak" manasındaki. İşletim sistemleri, programlar vs., bütün testleri bittikten sonra CD ve/veya DVD'ye basım için ilgili firmaya yollanır. bu aşamaya RTM adı verilir.
Not : Direk indirme linkleri
32 bit için Microsoft SQL Server 2008 R2 Express Edition with Advanced Services
http://download.microsoft.com/download/9/7/6/9761df25-cbd8-4d48-9415-065f6bd4e63d/SQLEXPRADV_x86_ENU.exe
64 bit için Microsoft SQL Server 2008 R2 Express Edition Database with Advanced Services
http://download.microsoft.com/download/9/7/6/9761df25-cbd8-4d48-9415-065f6bd4e63d/SQLEXPRADV_x64_ENU.exe
32 bit için Microsoft SQL Server 2008 R2 Express Edition Database with Management Tools
http://download.microsoft.com/download/5/5/8/558522e0-2150-47e2-8f52-ff4d9c3645df/SQLEXPRWT_x86_ENU.exe
64 bit için Microsoft SQL Server 2008 R2 Express Edition Database with Management Tools
http://download.microsoft.com/download/5/5/8/558522e0-2150-47e2-8f52-ff4d9c3645df/SQLEXPRWT_x64_ENU.exe
32 bit için Microsoft SQL Server 2008 R2 Express Edition Management Tools
http://download.microsoft.com/download/4/2/a/42a5a62f-9290-45cb-84cf-6a4e17888fde/SQLManagementStudio_x86_ENU.exe
64 bit için Microsoft SQL Server 2008 R2 Express Edition Management Tools
http://download.microsoft.com/download/4/2/a/42a5a62f-9290-45cb-84cf-6a4e17888fde/SQLManagementStudio_x86_ENU.exe
32 bit için Microsoft SQL Server 2008 R2 Express Edition Database Only
http://download.microsoft.com/download/5/1/a/51a153f6-6b08-4f94-a7b2-ba1ad482bc75/SQLEXPR_x86_ENU.exe
64 bit için Microsoft SQL Server 2008 R2 Express Edition Database Only
http://download.microsoft.com/download/5/1/a/51a153f6-6b08-4f94-a7b2-ba1ad482bc75/SQLEXPR_x64_ENU.exe